As stated before, public key challenge-response identification protocols like [2][3][4][5][6][26] have 3 general stages (commitment, challenge, response) like the scheme offered in this paper where for some more operation and the multiple key agreement ability added to these stages of the scheme, our protocol has become much more superior over the mentioned schemes.

Implementing the challenge-response encryption was surprisingly easy by building on the open source tools from Yubico as well as the existing full disk encryption solution from Debian," says Tollef Fog Heen, Debian package maintainer.

The technology is based around a challenge-response system, an active filtering algorithm that requires the sender of each message to validate themselves before they can be accepted onto a user's authorised senders list.

Nathan continued, "By introducing the ICard family, we are breaking the $3 price barrier for OTP in a card format, expanding our offerings to include challenge-response functionality, and enabling OTP security within existing systems.

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